[PATCH 18/19] Added --force option to push

@@ -32,6 +32,8 @@ b,branch=     create a new branch from the split subtree
 ignore-joins  ignore prior --rejoin commits
 onto=         try connecting new tree to an existing one
 rejoin        merge the new branch back into HEAD
+ options for 'push'
+f,force       use force push
  options for 'add', 'merge', 'pull' and 'push'
 squash        merge subtree changes as a single commit
 "

@@ -90,6 +92,7 @@ while [ $# -gt 0 ]; do
 		-b) branch="$1"; shift ;;
 		-P) prefix="$1"; shift ;;
 		-m) message="$1"; shift ;;
+        -f|--force) force=1 ;;
 		--no-prefix) prefix= ;;
 		--onto) onto="$1"; shift ;;
 		--no-onto) onto= ;;

@@ -790,10 +793,14 @@ cmd_push()
 	      repository=$(git config -f .gittrees subtree.$prefix.url)
         refspec=$(git config -f .gittrees subtree.$prefix.branch)
       fi
+        push_opts=
+        if [ "$force" == "1" ]; then
+            push_opts="$push_opts --force"
+        fi
 	    echo "git push using: " $repository $refspec
 	    rev=$(git subtree split --prefix=$prefix)
 	    if [ -n "$rev" ]; then
-	        git push $repository $rev:refs/heads/$refspec
+	        git push $push_opts $repository $rev:refs/heads/$refspec
 	    else
 	        die "Couldn't push, 'git subtree split' failed."
 	    fi

@@ -278,6 +278,11 @@ OPTIONS FOR split
 	'--rejoin' when you split, because you don't want the
 	subproject's history to be part of your project anyway.

+OPTIONS FOR push
+----------------
+-f::
+--force::
+    Uses 'git push --force'.

 EXAMPLE 1. Add command
 ----------------------